Pure Sine wave UPS design + Circuit Diagram

Replies

• 

  kashmirihasan

  anyone here?
• 

  Jeffrey Arulraj

  Hey man Sine wave got from inverters can't be 100% pure
  
  But one solution I can think of is using a VCO tuned to the same frequency of the output of inverter and thus we get nearly smooth sine wave
  
  PS:But why do you need 100% pure sine wave
• 

  kashmirihasan

  so u are saying 100 % pure sine wave doesnt exist?
• 

  kashmirihasan

  i need pure sine wave for my computer
• 

  Jeffrey Arulraj

  kashmirihasan

  i need pure sine wave for my computer

  Your computer is designed to work in a wide range of voltage and fixed 50 Hz or 60 Hz frequency
  
  This signal doesnot neccessarily be sine wave it can easily work if the input is a square wave as well
  
  In general if your system has SMPS the input signal is immediately converted into DC for utilisation so the signal you are using has less importance
• 

  Cyborg 009

  MY BE project SOLAR MPPT SINE WAVE INVERTER ...
• 

  Cyborg 009

  No need for pure sine in smps devices which use rectifiers in first stage ..
  all ur hard work of creating sine wave goes down the drain when it converted to dc ..
  CFL's & computers work well at 230V Dc ..
• 

  Jeffrey Arulraj

  Cyborg 009

  No need for pure sine in smps devices which use rectifiers in first stage ..
  all ur hard work of creating sine wave goes down the drain when it converted to dc ..
  CFL's & computers work well at 230V Dc ..

  Not 230 V DC friend
  
  That will be 230 V AC equivalent DC voltage Which is 230/(2)^1/2
• 

  Cyborg 009

  230V from mains is rms voltage ...Vpeak = 325V
  230Vrms AC= 230V DC
• 

  kashmirihasan

  my power supply got burnt bcz i used modified sine wave inverter. my friend told me to use pure sine wave ups.
• 

  Cyborg 009

  you made the inverter ???
  in mod sine the o/p sits at zero for sometime to resemble sine wave ..
• 

  kashmirihasan

  nope inverter was built by my friend. but he told me it was modified sine wave and sensitive devices like computer get burnt out becz of modified sine wave ...bcz in an inverter u can never have pure sine wave with a chopper
• 

  Cyborg 009

  some info on pwm inverter..
  #-Link-Snipped-#
  
  First step to produce 325V dc from 12v dc .It can be done using a push-pull dc dc converter.. O/P can be adjusted to 230VDC & can be diredtly used to power SMPS circuits ..
  12V / 325V 150W DC/DC converter
  
  2nd step to provide sinusoidal PWM signals to H bridge powered by 325v DC ..
  then the o/p of bridge is filtered to get 230V AC pure sine ..@ 1-5% THD
  I used atmega16 & sine lookup table to produce the required pwm signals .
• 

  arunvtkl

  100% pure sine wave inverter using pic 16F628A chip
  #-Link-Snipped-#
• 

  manojCC

  after all you need to convert a sine wave ups into Dc at the end...why you wand to go around a bush when you have clear path to walk..
• 

  Jeffrey Arulraj

  manojCC

  after all you need to convert a sine wave ups into Dc at the end...why you wand to go around a bush when you have clear path to walk..

  Well I don't agree with this term in all practical scenario. Some circuits need AC and so we need invertors to boost them up don't you think that they als need some justice done to them
  
  Pure Sine wave circuits is not practically feasible Noises will be there nearly 99% pure is an apt word for describing the output of pic
• 

  a.alandkar

  100% pure sine wave can be generated. Here are some steps to achieve it.
  1. get sine(50Hz) weighted PWM with a carrier of 2-3KHz as per ur convenience
  2. get them inverted.
  3. now by using digital logic make 4 pulses of those 2 pulse.
  4. get all the 4 pulses isolated and use them to fire IGBT/MOSFETs.
  5. The resultant o/p will be sine wave. You can verify it by using R-C or L-C at the o/p stage.
• 

  vamsi kancharla

  kashmirihasan

  How to make a pure sine wave ups ??? any circuit diagram? and what is the difference between a pure sine wave ups and modified sine wave?

  pure sine wave(98%) inverters/ups are available in the markets to buy then why to design that to for computers time consuming task